Kings of Leon Cancel Summer Tour

After problems with their lead singer, Kings of Leon are calling off their summer tour.

The band said in a Monday statement: “We are so sorry to say Kings of Leon are canceling their entire US tour due to Caleb Followill suffering from vocal issues and exhaustion…The band is devastated, but in order to give their fans the shows they deserve, they need to take this break. Unfortunately, the US dates cannot be rescheduled due to the band’s international tour schedule.”

It appears things went from bad to worse during their show, when Caleb walked off stage saying he was going to be sick. He never returned, but his brother Jared Followill tried to calm the crowd.

“Caleb’s just a little unfit to play the rest of the show,” he reportedly told concert goers. “It’s really not our fault, it’s Caleb. He can’t play the rest of the show. We will be back as soon as possible.”

While the official statement suggested “vocal issues and exhaustion,” Caleb’s hinted at much deeper issues. He tweeted Sunday night: “Dallas, I cannot begin to tell you how sorry I am. There are internal sicknesses & problems that have needed to be addressed. No words.”

He added: “I love our fans so much. I know you guys aren’t stupid. I can’t lie. There are problems in our band bigger than not drinking enough Gatorade.”